In many applications Ctrl-Shift-U clears the input or password field and provides a quick way to correct the password when one did a typo when entering a password quickly but does not know exactly where.
Programs like su and sudo on the shell and xscreensaver support this shortcut and it would be helpful when the KDE screenlocker (and possible the login manager) would support it as well.
A possibly relevant merge request was started @ https://invent.kde.org/frameworks/plasma-framework/-/merge_requests/607
Git commit 9e52fe8c02c06e8a46338edf39cb84899b76acbd by Aleix Pol.
Committed on 20/09/2022 at 15:41.
Pushed by apol into branch 'master'.
Clear PasswordField with Ctrl+Shift+U
It seems others do it too and it makes sense.
M +6 -0 src/declarativeimports/plasmaextracomponents/qml/PasswordField.qml